What mean fl.oz in perfume?

oz indicates to the volume of the bottle i.e: 1.0 oz = 30 ml

1.7 oz = 50 ml

2.5 oz = 75 ml

3.4 oz = 100 ml

4.2 oz = 125 ml

6.8 oz = 200 ml

8.4 oz = 250 ml